Thermal Cycler comparisons?

Hello everyone,
I am seeking information on thermal cyclers and would like to find an
article that compares the various makes and models for efficiency, speed,
temp. stability etc. Has anyone seen such articles or know of any
published comparisons? We are going to purchase additional cyclers and
would like to get the most out of it.
Thanks in advance
Kevin
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Kevin Macon Email: kmacon at uab.edu
University of Alabama at Birmingham Phone: (205) 934-0900
THT 454 Fax: (205) 934-2126
UAB Station
Birmingham, AL 35294